package com.y2w.gulimall.cart.interceptor;


import com.y2w.common.constant.CartConstant;
import com.y2w.common.vo.MemberRespVo;
import com.y2w.gulimall.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

import static com.y2w.common.constant.AuthServerContant.LOGIN_USER;
import static com.y2w.common.constant.CartConstant.TEMP_USER_COOKIE_TIMEOUT;

/**
 * 执行目标方法之前，判断用户登录状态，并封装传递给controller目标请求
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal=new ThreadLocal<>();
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(LOGIN_USER);
        if (member!=null){
        //    用户登录了
            userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if(cookies!=null&&cookies.length>0){
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }

            }
        }
        //没有临时用户，一定要先创建
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid= UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        threadLocal.set(userInfoTo);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo=threadLocal.get();
        if(!userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
            threadLocal.remove();
        }
    }
}
